THE SUPPLIER FOR THE GLASS INDUSTRY

  • The history of glass

    Only after the blowpipe was invented (around the beginning of our era), it was possible to give bottles and glasses a different shape. Quickly, people learned to give glass different colours by adding certain substances during the melting process. Glass itself was probably invented around 2500 B.C. in Egypt or Mesopotamia. At first, it was exclusively used for the production of decorative objects. The Egyptians were the first to use glass in utensils. They wrapped hot, viscous glass around a clay core to manufacture bottles and jars for the preservation of liquids such as balms and perfumes.

  • The production of glass
    Glass mainly consists of silicon oxide, better known as sand. Merely molten sand is not suitable for the production of bottles. A melting agent is required, i.e. sodium (Na2O) or potassium (K20). In order to obtain processable glass, a solidifying agent is required: calcium (CaO). Since 1830, it is assumed that a ratio of 6 parts of sand, 1 part of soda and 1 part of calcium is a good combination.
    Currently, hardly any glass packaging is made on exclusively raw materials. The use of recycled glass, named cullet, instead of raw materials is continuously growing.
    A new green bottle can be made from 90% recycled glass without any concessions where shape, colour and quality are concerned. Colourless or flint packaging glass contains approximately 50% recycled cullet.
  • The use of recycled glass (cullet)
    Currently, the most important raw material for the production of new glass is “recycled glass”. The recycled glass must comply with the quality standards of the glass manufacturer. Strict norms apply to the presence of ceramics, stone and porcelain, heat-resistant materials, metal, plastics and organic materials. In addition, the cullet must have the right colour, size, composition, etcetera. GRL takes the individual customer specifications very seriously, so you can count on the best quality.

    The purer the cullet is, the more cullet can be used for the production of new glass. The use of recycled glass offers the following benefits for glass manufacturers and for the environment:

    • A lower emission of CO2: up to 45% less CO2 than when using raw materials in the production of green glass at 90% use of cullet.
    • Lower energy consumption: per 4 % use of cullet, 1% of energy is saved.